Log Message: 
Better control over number of points that can be undefined, and
new ability to specify required test points plus additional random
ones. (Previously, if you set the test points, no random points were
generated.) For example:
$f = Formula("(x^21)/(x1)");
$f>{test_at} = [[1]]; # test at x=1 plus random points
as opposed to
$f>{test_points} = [[1],[0],[1]];
which tests only the points x = 1, x = 0 and x = 1.
